ifconfig

llllllllllllllllll/0_nnnnnnnnnnnnnnnnnnnnnnnn/code

@@ -1 +1 @@
-ifconfig
+ifconfig -a

llllllllllllllllll/0_nnnnnnnnnnnnnnnnnnnnnnnn/codeanswer

@@ -1 +1,16 @@
-df -h
+
+echo "Try"
+
+for i in $(ip -o link show | awk -F': ' '{print $2}'); \
+do mac=$(ethtool -P $i) \
+&& printf '%-10s %-10s\n' "$i" "$mac"; \
+done
+
+echo "OR"
+
+ls -l /sys/class/net/
+
+
+echo "So, actual devices show in /sys/class/net. Note that aliases (like lan:0) do not (so you can tell which are aliases). "
+
+echo "And you can clearly see which are actual hardware (lan) and which aren't (br0, lo, tun0)."

llllllllllllllllll/0_nnnnnnnnnnnnnnnnnnnnnnnn/info

@@ -1,4 +1 @@
-INFO: Task  Name
-
-*Asciidoc Task description*
- 
+Display the configuration of all interfaces, both active and inactive. 

llllllllllllllllll/0_nnnnnnnnnnnnnnnnnnnnnnnn/q-info

@@ -1 +1 @@
-Find which specific ethernet device corresponds to a specific port 
+Find if a network interface is physical (device) or virtual (alias)?

llllllllllllllllll/intro

@@ -1 +1,47 @@
-intro ontro
+ifconfig stands for "interface configuration." 
+
+It is used to *view and change the configuration* of the network interfaces on your system.
+
+Running the ifconfig command with no arguments, like this:
+
+
+[source,bash]
+----
+ifconfig
+----
+
+...displays information about all network interfaces currently in operation. The output will resemble the following:
+
+
+[source,bash]
+----
+
+eth0      Link encap:Ethernet  *HWaddr* 09:00:12:90:e3:e5                   //  <1>
+          inet addr:192.168.1.29 Bcast:192.168.1.255  Mask:255.255.255.0
+          inet6 addr: fe80::a00:27ff:fe70:e3f5/64 Scope:Link
+          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
+          RX packets:54071 errors:1 dropped:0 overruns:0 frame:0
+          TX packets:48515 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:1000 
+          RX bytes:22009423 (20.9 MiB)  TX bytes:25690847 (24.5 MiB)
+          Interrupt:10 Base address:0xd020 
+lo        Link encap:Local Loopback   // <2>
+          inet addr:127.0.0.1  Mask:255.0.0.0
+          inet6 addr: ::1/128 Scope:Host
+          UP LOOPBACK RUNNING  MTU:16436  Metric:1
+          RX packets:83 errors:0 dropped:0 overruns:0 frame:0
+          TX packets:83 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:0 
+          RX bytes:7766 (7.5 KiB)  TX bytes:7766 (7.5 KiB)
+----
+<1> *HWaddr* This is your MAC address
+>1> *eth0* is the first Ethernet interface. (Additional Ethernet interfaces would be named *eth1,* *eth2,* etc.) This type of interface is usually a NIC connected to the network by a category 5 cable.
+<2> *lo* is the loopback interface. This is a special network interface that the system uses to communicate with itself.
+
+
+
+*Configuring an interface*
+
+ifconfig can be used at the command line to configure (or re-configure) a network interface. 
+
+This is often unnecessary since this configuration is often handled by a script when you boot the system. If you'd like to do so manually, you will need superuser privileges, so we'll use sudo again when running these commands.